#include "../logs/bitlog.h"
#include <unistd.h>

/*
    日志落地模块拓展
    以时间进行文件的滚动,实际上是以时间段进行滚动
        实现思想: 以当前系统时间,取模时间段大小,可以得到当前时间段是第几个时间段
            每次以当前系统时间取模,判断与当前文件的时间段是否一致,不一致代表不是同一个时间段
*/

enum class TimeGap
{
    GAP_SECOND,
    GAP_MINUTE,
    GAP_HOUR,
    GAP_DAY,
};

class RollByTimeSink : public bitlog::LogSink
{
public:
    // 传入时传入文件名,并打开文件,将操作句柄管理起来
    RollByTimeSink(const std::string& basename, TimeGap gap_type)
        :_basename(basename)
    {
        switch(gap_type)
        {
        case TimeGap::GAP_SECOND:
            _gap_size = 1;
            break;
        case TimeGap::GAP_MINUTE:
            _gap_size = 60;
            break;
        case TimeGap::GAP_HOUR:
            _gap_size = 3600;
            break;
        case TimeGap::GAP_DAY:
            _gap_size = 3600 * 24;
            break;
        }

        _cur_gap = _gap_size == 1 ? bitlog::util::Date::now() : bitlog::util::Date::now() % _gap_size;
        std::string filename = createNewFile();
        // 打开文件
        bitlog::util::File::createDirectory(bitlog::util::File::path(filename));
        _ofs.open(filename, std::ios::binary | std::ios::app);
        assert(_ofs.is_open());
    }

    // 把日志写入文件
    void log(const char* data, size_t len)
    {
        time_t cur = bitlog::util::Date::now();
        if (cur % _gap_size != _cur_gap)
        {
            _ofs.close();
            std::string filename = createNewFile();
            _ofs.open(filename, std::ios::binary | std::ios::app);
            assert(_ofs.is_open());
        }

        _ofs.write(data, len);
        assert(_ofs.good());
    }
private:
    std::string createNewFile()
    {
        // 获取系统时间
        time_t t =  bitlog::util::Date::now();
        struct tm lt;
        localtime_r(&t, &lt);
        std::stringstream filename;
        filename << _basename;
        filename << lt.tm_year + 1900;
        filename << lt.tm_mon + 1;
        filename << lt.tm_mday;
        filename << lt.tm_hour;
        filename << lt.tm_min;
        filename << lt.tm_sec;
        filename << ".log";
        return filename.str();
    }
private:
    std::string _basename;
    std::ofstream _ofs;
    size_t _cur_gap;  // 当前是第几个时间段
    size_t _gap_size;  // 时间段的大小
};

int main()
{
    std::unique_ptr<bitlog::LoggerBuilder> builder(new bitlog::GobalLoggerBuilder());
    builder->buildLoggerName("async_logger");
    builder->buildLoggerLevel(bitlog::LogLevel::value::WARN);
    builder->buildFormatter("[%c][%f:%l]%m%n");
    builder->buildLoggerType(bitlog::LoggerType::LOGGER_ASYNC);
    builder->buildSink<RollByTimeSink>("./logfile/roll-async-by-time", TimeGap::GAP_SECOND);
    bitlog::Logger::ptr logger = builder->build();

    size_t cur = bitlog::util::Date::now();
    while (bitlog::util::Date::now() < cur + 5)
    {
        logger->fatal("这是一条测试日志");
        usleep(1000);
    }

    return 0;
}
